9, then did ANSI Delete Line on line 10, the selection highlight
would move up a line even though it wasn't over any text that
actually moved. Easy to reproduce in the likes of vi. Trivial fix.
[originally from svn r1334]
* selection), and also selanchor (for one being
* selected as we speak).
*/
- seltop = sb ? -savelines : 0;
+ seltop = sb ? -savelines : topline;
if (selstart.y >= seltop && selstart.y <= botline) {
selstart.y--;